https://forums.autodesk.com/t5/revit-mep-forum/duct-error-message/m-p/11436670#M16397 <P>If the duct is not the same size as the connector in the RTU, you will need a transition. If you are not allowing enough room for the transition, Revit doesn't understand.</P><P>&nbsp;</P><P>You need to either draw the duct long enough to allow room for the transition in the routing preferences to fit or use the size of the connector on the RTU for your duct.</P> Wed, 21 Sep 2022 16:28:02 GMT RSomppi 2022-09-21T16:28:02Z https://forums.autodesk.com/t5/revit-mep-forum/duct-error-message/m-p/11436612#M16396 <P>I keep trying to draw duct coming from the Roof top unit but every time I draw the return duct it gives me an error message and it turns the duct from rectangular duct (which is what I want) to a duct fitting. See image below...&nbsp;</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="maritza482LW_0-1663776229195.png" style="width: 600px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1118863i8A658F6C801C42F9/image-size/medium?v=v2&amp;px=400" role="button" title="maritza482LW_0-1663776229195.png" alt="maritza482LW_0-1663776229195.png" /></span></P><P>&nbsp;</P> Wed, 21 Sep 2022 16:04:00 GMT https://forums.autodesk.com/t5/revit-mep-forum/duct-error-message/m-p/11436612#M16396 maritza482LW 2022-09-21T16:04:00Z https://forums.autodesk.com/t5/revit-mep-forum/duct-error-message/m-p/11436670#M16397 <P>If the duct is not the same size as the connector in the RTU, you will need a transition. If you are not allowing enough room for the transition, Revit doesn't understand.</P><P>&nbsp;</P><P>You need to either draw the duct long enough to allow room for the transition in the routing preferences to fit or use the size of the connector on the RTU for your duct.</P> Wed, 21 Sep 2022 16:28:02 GMT https://forums.autodesk.com/t5/revit-mep-forum/duct-error-message/m-p/11436670#M16397 RSomppi 2022-09-21T16:28:02Z